chemical engineering stoichiometry Mcqs
201. Carborundum used for making crucibles for melting non-ferrous metals is chemically________________?
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A. Zirconium sulphate

B. Silicon nitride

C. Silicon carbide

D. Crystalline magnesia

202. Pick out the wrong statement?
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A. Graphite refractories are also called plumbago refractories

B. Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28

C. Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks

D. Calcined magnesite is also called dead burnt magnesite

203. The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 __________?
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A. 1023

B. 1026

C. 1019

D. 1020
204. Osmotic pressure of the solution can be increased by_________________?
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A. Diluting the solution

B. Increasing the volume of the vessel containing the solution

C. None of these

D. Decreasing its temperature

205. For any system, the _____________ heat of solution is dependent on the temperature and the adsorbate concentration?
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A. Integral

B. Differential

C. Both A. & B.

D. Neither A. nor B.

206. Lower wall courses of soaking pits are made of _____________ bricks to avoid the action of molten slag & scale?
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A. Silica

B. Silicon carbide

C. Low duty fireclay

D. Chrome or magnesite
207. Mass number of an atom is the sum of the numbers of_________________?
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A. Neutrons and protons

B. Protons and electrons

C. Neutrons and electrons

D. Both A. & B.
208. A gas at 0C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be_______________?
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A. 0K

B. -136.5C

C. -273C

D. 136.5K

209. Cp Cv for an ideal gas is equal to________________?
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A. R/2

B. 2R

C. 3R

D. R
210. Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the________________?
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A. All A., B. & C.

B. Molal latent heat of vaporisation is constant within the limited temperature range

C. Vapor follows the ideal gas law

D. Volume in the liquid state is negligible compared with that in the vapor state

211. Pick out the wrong unit conversion of temperature?
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A. F = (C + 17.778) 1.8

B. R = 273 + F

C. Temperature difference of 1K = 1C = 9/5F

D. C = (F- 32) 0.555

212. The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the_______________?
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A. Nature of both the gas & the liquid

B. Temperature

C. Total pressure

D. None of these
213. Diffusion is that property by virtue of which a perfume bottle when opened up in a room, makes the whole room fragrant with its smell. If a perfume X diffuses twice as fast as another perfume Y; what is the molecular weight of Y, if the vapor density of gas X is 2? Molecular weight of gas X is to be assumed to be 2 ?
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A. 2

B. 4

C. 8

D. 16
214. Fireclay bricks are not used in the________________?
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A. Beehive coke oven

B. By-product coke oven walls

C. Coke oven regenerators

D. Combustion chamber of B.F. stoves

215. The density of a liquid is 1500 kg/m3. Its value in gin/litre will be equal to________________?
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A. 150

B. 15

C. 1500

D. 1.5

216. 1 kg/cm2 is equal to________________?
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A. 1 KPa

B. 10 metres of water column

C. 1 metre of water column

D. 760 torr

217. A gas mixture contains 6 moles of H2 and 2 moles of N2. If the total pressure of the gaseous mixture is 4 kgf/cm2; then the partial pressure of N2 in the mixture will be _____________ kgf/cm2 ?
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A. 4

B. 2

C. 8

D. 1
218. Pick out the wrong conversion formula for the conversion of weight units ?
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A. 1 tonne = 1000 kg = 22.046 lbs

B. 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons

C. 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton

D. None of these
219. Pick out the wrong statement?
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A. perature, then the fraction of total pressure exerted by the oxygen is 1/2

B. When equal weights of oxygen and methane are mixed in an empty reactor at room

C. One kg mole of an ideal gas at N.T.P occupies 22400 Nm3

D. Ten times dilution of a normal solution (N) reduces its normality to N/10

E. Volume occupied by 9.034 x 1023 atoms of oxygen in ozone (O3) at NTP will be 11200 c.c

220. Giga stands for__________________?
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A. 12-Oct

B. 1012

C. 1015

D. 109
221. The vapor pressure of water at 100C is__________________?
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A. 76 cms of Hg

B. 100 N/m2

C. 760 mm wc

D. 13.6 cms of Hg

222. Internal energy is independent of the ____________ for an ideal gas?
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A. Pressure

B. Volume

C. Both A. & B.

D. Neither A. nor B.

223. According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________?
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A. T1.5

B. T0.5

C. T

D. T2

224. Clausius Clapeyron equation applies to the _____________ process?
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A. All A., B. & C.

B. Vaporisation

C. Sublimation

D. Melting

225. Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263C and 2 atm ?
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A. 3

B. 2

C. 1

D. 4

226. N.T.P. corresponds to__________________?
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A. 1 atm absolute pressure & 0C

B. 101.325 KPa gauge pressure & 0C

C. 760 torr & 15C

D. 760 mm Hg gauge pressure & 0C

227. The vapor pressure of liquids of similar chemical nature at any particular temperature _______________ with increase in the molecular weight?
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A. Decreases

B. Remains unchanged

C. Increases

D. Either A. or B.; depends on the liquid

228. Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ____________________?
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A. Do work equal to loss in kinetic energy

B. Do not lose energy on collision

C. Are above the inversion temperature

D. Do not exert attractive force on each other
229. ______________ equation gives the effect of temperature on heat of reaction ?
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A. Maxwells

B. Kistyakowsky

C. Kirchoffs

D. Antoine

230. Air at a temperature of 20C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20C is 17.5 mm Hg?
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A. 78.51

B. 80

C. 80.38

D. 79.62
231. Number of gm moles of solute dissolved in 1 kg of solvent is called its___________________?
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A. Molarity

B. Normality

C. Molality

D. Formality

232. In osmosis through a semi-permeable membrane, diffusion of the___________________?
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A. None of these

B. Solute takes place

C. Solvent is from low concentration to high concentration region

D. Solvent is from high concentration to low concentration region

233. No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules____________________?
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A. Do work equal to loss in kinetic energy

B. Are above the inversion temperature

C. Exert no attractive force on each other

D. Collide without loss of energy

234. The OH- concentration in a solution having pH value 3 is____________________?
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A. 3-Oct

B. 10-11

C. 10-Oct

D. 13-Oct

235. 1 torr is equal to ______________ mm Hg column?
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A. 10

B. 0.1

C. 1000

D. 1
236. 1m3 is approximately equal to_________________?
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A. 28 litres

B. 4.5 litres

C. 35 ft3

D. 4.5 ft3

237. At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to___________________?
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A. Increased collision rate among molecules

B. Decrease in mean free path

C. Increase in molecular attraction

D. Increase in average molecular speed

238. One Therm is equivalent to___________________?
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A. 105 BTU

B. 109 BTU

C. 109 kcal

D. 105 kcal

239. Pure oxygen is mixed with air to produce an enriched air containing 50 volume % of oxygen. The ratio of moles of air to oxygen used is_________________?
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A. 0.58

B. 0.2

C. 1.72

D. 0.5

240. The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements. This is the statement of___________________?
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A. Law of Petit and Dulong

B. Kopps rule

C. Nernst heat theorem

D. Troutons rule

241. A butane isomerisation process produces 70 k.mole/hr of pure iso-butane. A purge stream removed continuously, contains 85% n-butane and 15% impurity (mole%). The feed stream is n-butane containing 1% impurity (mole%). The flow rate of the purge stream will be_________________?
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A. 4 kmole/hr

B. 5 kmole/hr

C. 3 kmole/hr

D. 6 kmole/hr

242. A rigid vessel containing three moles of nitrogen gas at 30C is heated to 250C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.C and, Cv = 20.8 J/mole.C. The heat required, neglecting the heat capacity of the vessel, is__________________?
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A. 4576 J

B. 12712 J

C. 13728 J

D. 19206 J
243. Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?
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A. (Patm Pvw)xB

B. PvB

C. xB.PvB

D. xB.Patm

244. Vapor pressure of water at 100C is about _______________ bar?
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A. 10.13

B. 101.3

C. 0.1013

D. 1.013
245. Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because_________________?
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A. The strong base and strong acid reacts in aqueous solution

B. The strong base and strong acid reacts completely

C. The salt formed does not hydrolyse

D. Only OH- and H+ ions react in every case
246. Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ?
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A. Chlorine

B. All the gases will have the same KE

C. Nitrogen

D. Ethane

247. The depression in freezing point of a solution is________________?
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A. Inversely proportional to the mass of solvent

B. Directly proportional to the mole of solute

C. Both A. and B.

D. Neither A. nor B.

248. Which of the following is followed by an ideal solution ?
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A. Troutons rule

B. Boyles law

C. Amagats law

D. Raoults law
249. In case of a solution (not of a solid in a liquid), whose total volume is more than the sum of volumes of its components in their pure states, solubility is__________________?
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A. Decreased with the increase in pressure

B. Unchanged by the pressure change

C. Independent of the temperature

D. Increased with the increase in pressure

250. The most convenient way of expressing solution concentration is in terms of___________________?
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A. Normality

B. Mole fraction

C. Molality

D. Molarity